content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * -----------------
   * XYCoordinate.java
   * -----------------
   * (C) Copyright 2007, 2008, by Object Refinery Limited and Contributors.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 30-Jan-2007 : Version 1 (DG);
   * 25-May-2007 : Moved from experimental to the main source tree (DG);
   *
   */
  
  package org.jfree.data.xy;
  
  import java.io.Serializable;
  
  /**
   * Represents an (x, y) coordinate.
   *
   * @since 1.0.6
   */
  public class XYCoordinate implements Comparable, Serializable {
  
      /** The x-coordinate. */
      private double x;
  
      /** The y-coordinate. */
      private double y;
  
      /**
       * Creates a new coordinate for the point (0.0, 0.0).
       */
      public XYCoordinate() {
          this(0.0, 0.0);
      }
  
      /**
       * Creates a new coordinate for the point (x, y).
       *
       * @param x  the x-coordinate.
       * @param y  the y-coordinate.
       */
      public XYCoordinate(double x, double y) {
          this.x = x;
          this.y = y;
      }
  
      /**
       * Returns the x-coordinate.
       *
       * @return The x-coordinate.
       */
      public double getX() {
          return this.x;
      }
  
      /**
       * Returns the y-coordinate.
       *
       * @return The y-coordinate.
       */
      public double getY() {
          return this.y;
      }
  
      /**
       * Tests this coordinate for equality with an arbitrary object.
       *
       * @param obj  the object (<code>null</code> permitted).
       *
       * @return A boolean.
       */
      @Override
      public boolean equals(Object obj) {
          if (obj == this) {
              return true;
          }
          if (!(obj instanceof XYCoordinate)) {
              return false;
          }
          XYCoordinate that = (XYCoordinate) obj;
          if (this.x != that.x) {
              return false;
          }
          if (this.y != that.y) {
              return false;
          }
          return true;
      }
  
      /**
       * Returns a hash code for this instance.
       *
       * @return A hash code.
       */
      @Override
      public int hashCode() {
          int result = 193;
          long temp = Double.doubleToLongBits(this.x);
          result = 37 * result + (int) (temp ^ (temp >>> 32));
          temp = Double.doubleToLongBits(this.y);
          result = 37 * result + (int) (temp ^ (temp >>> 32));
          return result;
      }
  
      /**
       * Returns a string representation of this instance, primarily for
       * debugging purposes.
       *
       * @return A string.
       */
      @Override
      public String toString() {
          return "(" + this.x + ", " + this.y + ")";
      }
  
      /**
       * Compares this instance against an arbitrary object.
       *
       * @param obj  the object (<code>null</code> not permitted).
       *
       * @return An integer indicating the relative order of the items.
       */
      @Override
      public int compareTo(Object obj) {
          if (!(obj instanceof XYCoordinate)) {
              throw new IllegalArgumentException("Incomparable object.");
          }
          XYCoordinate that = (XYCoordinate) obj;
          if (this.x > that.x) {
              return 1;
          }
          else if (this.x < that.x) {
              return -1;
          }
          else {
              if (this.y > that.y) {
                  return 1;
              }
              else if (this.y < that.y) {
                  return -1;
              }
          }
          return 0;
      }
  
  }
  